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Threshold T-200. Help me choose a preamplifier

Good day, Colleagues!
Not so long ago, at an auction in Japan, I accidentally won the Threshold T-200 amplifier. I really wanted this brand, but I was looking for the T-800D model. But it turned out to buy this amplifier ... And now I am very tormented with the choice.
I spent two days on the internet looking for balanced amplifiers. Here is a list, is there anything on this list worth seeing?
Pass Labs X1 - 
This preamplifier is sold in Russia at a very good price, it seems to me. 1800 dollars. But I do not know his condition. The photographs show that the cable that connects the power supply and the preamplifier itself is frayed. And the power supply is not complete, but a small black box.
Pass Labs X2.5 - I found this preamp for 2000 euros in Croatia, but shipping will cost around 500 euros, so it is already very expensive for me. 
Black Ice F-360 - A very interesting preamplifier. The ad suggests that this preamp has very high detail and can expand the scene. :) But I don't believe in advertisements.
Leema Acoustics Pyxis ll -  This amplifier is quite expensive, I found it in my country for $ 2500 and this is a showcase sample. It has an impressive range of features, there is a phono stage, which I also need, and balanced inputs and outputs.
Electrocompaniet ec 4.7
Electrocompaniet EC 4.8
Krell KSL-2
Audia Flight Pre
Quad Artera Pre
Rotel RC-5000
Audio research LS-15
audio research LS-2B
Spectron Model 10
Audio research LS 17
BAT VK-30
McIntosh C2200 - But this is already very dear to me.

I really look forward to your help and advice in choosing.

vetusto
imhififan's avatar
imhififan
2,259 posts
 
For good voltage transfer from preamp to power amp it is better to have a low impedance at the output of the preamp and to have a high impedance at the input of the power amp.
We should using a minimum ratio of >1:10 to improve transfer efficiency and I recommend >1:20 which transfers > 95% of the voltage.
100Ω : 2000Ω = 1: 20
2000 / (2000+100) = 95%
If the ratio is low it will affected the system frequency response and noise floor. Also a preamp with high output impedance will has greatest possibility to hear differences in interconnect cables, a very low output impedance preamp will be immune to cable effects.

invalid
1,389 posts
 
Stereophile measured the input impedance of the T-200 at only 926 ohms.
imhififan's avatar
imhififan
2,259 posts
 
Stereophile measured the input impedance of the T-200 at only 926 ohms
If the input impedance of the T-200 only 926 ohms, the required output impedance of the preamp should be much lower!


invalid
1,389 posts
 
If the input impedance of the T-200 only 926 ohms, the required output impedance of the preamp should be much lower!


I would think that about 50 ohms would be safe or the op could just use go unbalanced.
vetusto OP
46 posts
 
Then the question is: what is the output impedance of Pass Labs X2.5? Because this is the only preamp I can afford on my $ 2000 budget. :)
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